CSS规则visibility:hidden和display:none都会导致元素不可见。这些是同义词吗?
当前回答
总结所有其他答案:
| visibility | display |
|---|---|
| element with visibility: hidden, is hidden for all practical purposes (mouse pointers, keyboard focus, screenreaders), but still occupies space in the rendered markup | element with display:none, is hidden for all practical purposes (mouse pointers, keyboard focus, screenreaders), and DOES NOT occupy space in the rendered markup |
| css transitions can be applied for visibility changes | css transitions can not be applied on display changes |
| you can make a parent visibility:hidden but a child with visibility: visible would still be shown | when parent is display:none, children can't override and make themselves visible |
| part of the DOM tree (so you can still target it with DOM queries) | part of the DOM tree (so you can still target it with DOM queries) |
| part of the render tree | NOT part of the render tree |
| any reflow / layout in the parent element or child elements, would possibly trigger a reflow in these elements as well, as they are part of the render tree. | any reflow / layout in the parent element, would not impact these elements, as these are not part of the render tree |
| toggling between visibility: hidden and visible, would possibly not trigger a reflow / layout. (According to this comment it does: What is the difference between visibility:hidden and display:none? and possibly according to this as well https://developers.google.com/speed/docs/insights/browser-reflow) | toggling between display:none to display: (something else), would lead to a layout /reflow as this element would now become part of the render tree |
| you can measure the element through DOM methods | you can not measure the element or its descendants using DOM methods |
| If you have a huge number of elements using visibility: none on the page, the browser might hang while rendering, as all these elements require layout, even though they are not shown | If you have a huge number of elements using display:none, they wouldn't impact the rendering as they are not part of the render tree |
资源:
https://developers.google.com/speed/docs/insights/browser-reflow http://www.stubbornella.org/content/2009/03/27/reflows-repaints-css-performance-making-your-javascript-slow/ visibility:hidden和display:none
其他信息:
还有一些浏览器支持特性，但它们似乎适用于非常老的浏览器，在其他答案中也有，所以我在这里没有讨论它们。 还有其他一些隐藏元素的方法，比如不透明度，或者屏幕外的绝对定位。所有这些方法在一些或其他的回答中都有涉及，并且都有一些缺点。 根据这条评论(可见性:hidden和display:none之间的性能差异)，如果你有很多元素使用display:none并且你将其更改为display:(其他)，它将导致单个回流，而如果你有多个可见性:hidden元素并且你将它们变为可见，它将导致每个元素的回流。(我不太明白)
其他回答
如果可视性属性设置为“hidden”，浏览器仍然会在页面上为内容占用空间，即使它是不可见的。 但是当我们将一个对象设置为“display:none”时，浏览器不会在页面上为其内容分配空间。
例子:
<div style="display:none">
Content not display on screen and even space not taken.
</div>
<div style="visibility:hidden">
Content not display on screen but it will take space on screen.
</div>
查看详细信息
显示:没有;既不会显示元素，也不会在页面上为元素分配空间，而可见性:隐藏;不会在页面上显示元素，但会在页面上分配空间。 在这两种情况下，我们都可以访问DOM中的元素。 为了更好地理解它，请查看以下代码: 显示:无vs可见性:隐藏
它们不是同义词——display:没有一个会从页面流中移除元素，页面的其余部分就像它不存在一样。
可见性:hidden在视图中隐藏元素，但不隐藏页面流，在页面上为其留下空间。
正如在这个堆栈的其他地方所描述的，这两者并不是同义词。Visibility:hidden将在页面上留下空白，而display:none将完全隐藏元素。我认为有必要讨论一下这是如何影响给定元素的子元素的。如果你要使用visibility:hidden，那么你可以用正确的样式显示该元素的子元素。但是对于display:none，不管你是否使用display: block | flex | inline | grid | inline-block，你都会隐藏子元素。
display: none;
它将不会出现在页面上，也不会占用任何空间。
visibility: hidden;
它隐藏了一个元素，但它仍然会占用与之前相同的空间。元素将被隐藏，但仍然会影响布局。
可见性:隐藏保留空间，而显示:无不保留空间。
无示例:https://www.w3schools.com/css/tryit.asp?filename=trycss_display_none
示例:https://www.w3schools.com/cssref/tryit.asp?filename=trycss_visibility
